package com.lagou.web.servlet;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SimplePropertyPreFilter;
import com.lagou.base.BaseServlet;
import com.lagou.dao.impl.CourseContentDao;
import com.lagou.pojo.Course;
import com.lagou.pojo.Course_Lesson;
import com.lagou.pojo.Course_Section;
import com.lagou.service.impl.CourseContentService;
import com.lagou.service.impl.CourseContentServiceImpl;
import org.apache.commons.beanutils.BeanUtils;

import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.List;
import java.util.Map;

@WebServlet("/courseContent")
public class CourseContentServlet extends BaseServlet {

    //展示对应课程的章节与课时信息
    public void findSectionAndLessonByCourseId(HttpServletRequest request, HttpServletResponse response){

        try {
            //1.获取参数
            String course_id = request.getParameter("course_id");
            //2.业务处理
            CourseContentService contentService = new CourseContentServiceImpl();
            List<Course_Section> list = contentService.findSectionAndLessonByCourseId(Integer.parseInt(course_id));
            //返回结果
            String result = JSON.toJSONString(list);

            response.getWriter().print(result);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //根据课程ID回显课程信息
    public void findCourseById(HttpServletRequest request,HttpServletResponse response){

        try {
            //1.获取参数
            String course_id = request.getParameter("course_id");

            //2.业务处理
            CourseContentService contentService = new CourseContentServiceImpl();
            Course course = contentService.findCourseByCourseId(Integer.parseInt(course_id));

            //3.返回JSON数据
            SimplePropertyPreFilter filter = new SimplePropertyPreFilter(Course.class,"id","course_name");
            String result = JSON.toJSONString(course, filter);
            response.getWriter().print(result);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     *保存&修改 章节信息
     */
    public void saveOrUpdateSection(HttpServletRequest request,HttpServletResponse response){

        try {
            //1.获取参数 从域对象中获取
            Map<String,Object> map = (Map)request.getAttribute("map");

            //2.创建Course_Section
            Course_Section section = new Course_Section();

            //3.使用BeanUtils工具类 将map中的数据封装到section中
            BeanUtils.populate(section,map);

            //4.业务处理
            CourseContentService contentService = new CourseContentServiceImpl();

            //判断是否携带ID
            if (section.getId() == 0){
                //新增操作
                String result = contentService.saveSection(section);

                //5.响应结果
                response.getWriter().print(result);
            }else {
                //修改操作
                String result = contentService.updateSection(section);
                response.getWriter().print(result);
            }

        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //修改章节状态
    public void updateSectionStatus(HttpServletRequest request,HttpServletResponse response){

        try {
            //1.接收参数
            int id = Integer.parseInt(request.getParameter("id")); //章节ID
            int status = Integer.parseInt(request.getParameter("status")); //章节状态

            //2.业务处理
            CourseContentService contentService = new CourseContentServiceImpl();

            String result = contentService.updateSectionStatus(id, status);

            //3.返回结果
            response.getWriter().print(result);
        } catch (IOException e) {

        }
    }

    /**
     * 保存&修改课时信息
     */
    public void saveOrUpdateLesson(HttpServletRequest request,HttpServletResponse response){

        try {
            //1.接收参数 从域对象中获取
            Map<String,Object> map = (Map)request.getAttribute("map");

            //2.创建Course_Lesson
            Course_Lesson lesson = new Course_Lesson();

            //3.使用BeanUtils工具类 将map中的数据封装到lesson中
            BeanUtils.populate(lesson,map);

            //4.业务处理
            CourseContentService contentService = new CourseContentServiceImpl();

            //判断是否携带ID
            if (lesson.getId() == 0){
                //保存操作
                String result = contentService.saveLesson(lesson);

                //6.响应结果
                response.getWriter().print(result);
            }else {
                //修改操作
                String result = contentService.updateLesson(lesson);
                response.getWriter().print(result);

            }

        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
